66761886 has 32 divisors (see below), whose sum is σ = 141356160. Its totient is φ = 20984544.

The previous prime is 66761861. The next prime is 66761887. The reversal of 66761886 is 68816766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66761887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3021 + ... + 11943.

It is an arithmetic number, because the mean of its divisors is an integer number (4417380).

Almost surely, 2^66761886 is an apocalyptic number.

66761886 is an abundant number, since it is smaller than the sum of its proper divisors (74594274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66761886 is a wasteful number, since it uses less digits than its factorization.

66761886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9000.

The product of its digits is 580608, while the sum is 48.

The square root of 66761886 is about 8170.7946981918. The cubic root of 66761886 is about 405.6730889414.

The spelling of 66761886 in words is "sixty-six million, seven hundred sixty-one thousand, eight hundred eighty-six".